Hi Vadim , This sounds familiar.....Please check if that code is a copy of the Kinetis driver. If so, see the changes that were done to it in https://github.com/apache/incubator-nuttx/pull/1273
David -----Original Message----- From: Вадим Ястребов [mailto:woody_haw...@mail.ru.INVALID] Sent: Friday, April 16, 2021 5:50 AM To: dev Subject: IMXRT1064 and 2 Ethernet interfaces Hello everyone, I have encountered a problem related to initializing 2 Ethernet interfaces on IMXRT1064 and I was wondering if you have any idea where to look for solutions. Sometimes both interfaces work fine. Sometimes, when initializing the second interface with ifconfig followed by ifup, the first one dies about 10 seconds later. Sometimes the first one stops responding to ping and the debug output is showing me "ipv4_input: WARNING: Not destined for us; not forwardable... Dropping!" and "ipv4_input: WARNING: IP packet shorter than length in IP header"... Although, I am not very sure if this debug output is related to my problem. Maybe it's something else.... I still need to dig deeper into it! Any suggestions will be greatly appreciated! Best Regards, Vadim Yastrebov